A prime meridian is an arbitrarily chosen meridian (a line of longitude) in a geographic coordinate system at which longitude is defined to be 0°. On a spheroid, a prime meridian and its anti-meridian (the 180th meridian in a 360°-system) form a great ellipse.

英文名称：prime meridian 0°经线 ，是计算东西经度的起点。 1884年国际会议决定用通过英国 格林威治 （Greenwich）天文台原址 子午仪 中心的经线为本初子午线。

Dec 27, 2024 · 本初子午线（英语： prime meridian ），即0度经线，亦称格林尼治子午线或本初经线，是经过英国 格林尼治天文台的一条经线（亦称子午线）。 本初子午线的东西两边分别定为 东经 和 西经 ，于180度相遇。

Jun 26, 2023 · The Prime Meridian is an imaginary line that divides the Earth into Eastern and Western Hemispheres. It is the longitude line with a value of 0 degrees and runs from the North Pole to the South Pole, passing through the Royal Observatory in Greenwich, London.

Sep 7, 2017 · A prime meridian is a geographic longitude which runs vertically along a sphere dividing it into two hemispheres. Any prime meridian is geographically and mathematically defined and is located at the 0-degree longitude and therefore is used as the base point for other longitudes which are measured in the degrees to the west or east of the prime ...

Dec 27, 2024 · Greenwich meridian, an imaginary line, last established in 1851, used to indicate zero degrees longitude. It passes through Greenwich, London, and ends at the North and South poles. Because it indicated zero degrees longitude, it was also known as the prime meridian.

Oct 19, 2023 · The prime meridian is the line of 0° longitude, the starting point for measuring distance both east and west around Earth. The prime meridian is arbitrary, meaning it could be chosen to be anywhere.

The Greenwich meridian is a prime meridian, a geographical reference line that passes through the Royal Observatory, Greenwich, in London, England. [1] From 1884 to 1974, the Greenwich meridian was the international standard prime meridian, used worldwide for

The prime meridian is the imaginary line that divides Earth into two equal parts: the Eastern Hemisphere and the Western Hemisphere. The prime meridian is also used as the basis for the world’s time zones.

The Prime Meridian is the meridian (line of longitude) that goes through the Royal Observatory, Greenwich in London it is also known as the International Meridian or Greenwich Meridian. Other longitudes are given as east or west of the Prime Meridian.